data centers (NGDC, NODC, NCDC) • Stewardship, products, and services for geophysical data from our Sun to Earth and Earth’s seafloor and solid earth environment, including Earth observations from space • Located in Boulder, CO • U.S. national archive for marine geophysical and geologic data - “preserving data for your great- grandchildren” • Users: scientists around the world, general public What is NGDC?
• Most at 1 or ⅓ arc- second resolution • Future work: high- quality DEMs for areas affected by Hurricane Sandy (to 1/9 arc-second) • Future collaborations with USGS NED for seamless topo/bathy Digital Elevation Models Contact: Barry Eakins (barry.eakins@noaa. gov)
• Historical surveys dating back to 1800s • Color-coded by decade • Polygons partially transparent, polys beneath still show through • In ArcGIS: convert layer transparency to color transparency NOS Hydrographic Surveys
surveys • Often 1 meter resolution or better • Now readable by GDAL, ArcGIS 10.2 (bugs recently addressed) • Hillshade visualizations: preview of data coverage and quality • Workflow: Python, GDAL, ImageMagick (multiply) • ~100 GB of imagery, ArcGIS Mosaic Dataset, ArcGIS Image Service NOS Hydrographic Survey BAGs